The Heat didn't let Ronny "get away." He was a free agent and exercised his right to sign with the team of his choice. Foremost, it's not as his Ronny held a specific role that had to be replaced, especially with the Heat utilizing smaller lineups. The fact that Ronny took the same minimum he could have made in Miami (if offered) likely makes it an issue of playing time, which disappeared for him in the playoffs. At this stage of free agency, with most of the league's cap space gone, you will start to see similar decisions from players, where playing time becomes the prime currency.